Keycloak allows unrestricted admin use of system and environment variables

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.9 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS

• CVE-2024-11736: 0.76% estimated exploitation activity in the next 30 days; percentile 55.18 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

A security vulnerability has been identified that allows admin users to access sensitive server environment variables and system properties through user-configurable URLs. Specifically, when configuring backchannel logout URLs or admin URLs, admin users can include placeholders like ${env.VARNAME} or ${PROPNAME}. The server replaces these placeholders with the actual values of environment variables or system properties during URL processing.

Published by the source

13 Jan 2025, 16:58 UTC

Last modified by the source

14 Jan 2025, 16:38 UTC

Source last checked

26 Oct 2026, 16:34 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-f4v7-3mww-9gc2

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# Patch Next advisory brief: CVE-2024-11736

Advisory: Keycloak allows unrestricted admin use of system and environment variables
IDs: CVE-2024-11736, GHSA-f4v7-3mww-9gc2
Record: https://patchnext.com/advisories/cve-2024-11736 (revision 1, source checked 26 Oct 2026, 16:34 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.keycloak:keycloak-quarkus-server 26.0.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.keycloak:keycloak-quarkus-server: affected < 26.0.8; fixed in 26.0.8

## Suggested inspection (read-only)
- Maven org.keycloak:keycloak-quarkus-server: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.keycloak:keycloak-quarkus-server.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-f4v7-3mww-9gc2 (GitHub-reviewed advisory GHSA-f4v7-3mww-9gc2 lists affected ranges: Maven org.keycloak:keycloak-quarkus-server >=0 <26.0.8)

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